論筏基設計用地盤反力係數

A Note on the Modulus of Subgrade Reaction for Raft Foundation Design

謝旭昇(Hsii-Sheng Hsieh) ； 程日晟(Jih-Cherng Cherng)

《地工技術》 53期 (1996/02) Pp. 45-54

https://doi.org/10.30140/SG.199602.0005

摘要

目前大樓基礎大部份採用筏式基礎，而地盤反力係數為一重要之設計參數。基本上地盤反力係數並非純粹由土壤性質決定，設計上須同時考慮土壤及結構之勁度以為選擇之基準。本文列舉現行決定地盤反力係數之各種方法，並以案例顯示其間之差異。本文亦討論連續壁及結構勁度對整體分析之影響，作者並依本身之設計經驗提供一組地盤反力係數值以供參考。但在目前地盤反力係數值仍位有定論之狀況下，筆者建議筏基設計時進行必要之敏感度分析。

關鍵字

筏基 ； 地盤反力係數

並列摘要

Most of the current high-rise buildings use raft foundation as their main foundation system, and the modulus of subgrade reaction (Ks) is considered as one of the essential design parameters. Basically, modulus of subgrade reaction is not just a soil parameter, it is affected by the structural stiffness as well. This paper lists various approaches for the selection of Ks; an example is provided for comparison purpose. The effects of diaphragm wall and structural stiffness is addressed, and the authors also recommend a set of Ks values for reference. For critical structural design, it is suggested that a sensitivity study on Ks be always carried out.

並列關鍵字

raft foundation ； modulus of subgrade reaction